html, body {
  padding: 0;
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}
svg {
  width: 100%;
  height: 100%;
  background: white;
}
.boundary_line {
  vector-effect: non-scaling-stroke;
  fill: none;
}
.boundary_strip {
  stroke: white;
  vector-effect: non-scaling-stroke;
  fill: none;
}